#!/usr/bin/env python
# encoding: utf-8

from __future__ import print_function
from waflib import Build, Logs, Options, Utils
from waflib.Configure import conf
from waflib.TaskGen import before_method, feature
import os.path, os
from collections import OrderedDict

import ap_persistent

SOURCE_EXTS = [
    '*.S',
    '*.c',
    '*.cpp',
]

COMMON_VEHICLE_DEPENDENT_LIBRARIES = [
    'AP_AccelCal',
    'AP_ADC',
    'AP_AHRS',
    'AP_Airspeed',
    'AP_Baro',
    'AP_BattMonitor',
    'AP_BoardConfig',
    'AP_Buffer',
    'AP_Common',
    'AP_Compass',
    'AP_Declination',
    'AP_GPS',
    'AP_HAL',
    'AP_HAL_Empty',
    'AP_InertialSensor',
    'AP_Math',
    'AP_Mission',
    'AP_NavEKF2',
    'AP_NavEKF3',
    'AP_Notify',
    'AP_OpticalFlow',
    'AP_Param',
    'AP_Rally',
    'AP_RangeFinder',
    'AP_Scheduler',
    'AP_SerialManager',
    'AP_Terrain',
    'AP_Vehicle',
    'DataFlash',
    'Filter',
    'GCS_MAVLink',
    'RC_Channel',
    'StorageManager',
    'AP_Tuning',
    'AP_RPM',
    'AP_RSSI',
    'AP_Mount',
    'AP_Module',
    'AP_Button',
    'AP_ICEngine',
    'AP_Frsky_Telem',
    'AP_FlashStorage',
]

def get_legacy_defines(sketch_name):
    return [
        'APM_BUILD_DIRECTORY=APM_BUILD_' + sketch_name,
        'SKETCH="' + sketch_name + '"',
        'SKETCHNAME="' + sketch_name + '"',
    ]

IGNORED_AP_LIBRARIES = [
    'doc',
    'GCS_Console',
]

@conf
def ap_get_all_libraries(bld):
    libraries = []
    for lib_node in bld.srcnode.ant_glob('libraries/*', dir=True, src=False):
        name = lib_node.name
        if name in IGNORED_AP_LIBRARIES:
            continue
        if name.startswith('AP_HAL'):
            continue
        if name == 'SITL':
            continue
        libraries.append(name)
    libraries.extend(['AP_HAL', 'AP_HAL_Empty'])
    return libraries

@conf
def ap_common_vehicle_libraries(bld):
    return COMMON_VEHICLE_DEPENDENT_LIBRARIES

_grouped_programs = {}

@conf
def ap_program(bld,
               program_groups='bin',
               program_dir=None,
               use_legacy_defines=True,
               program_name=None,
               **kw):
    if 'target' in kw:
        bld.fatal('Do not pass target for program')
    if 'defines' not in kw:
        kw['defines'] = []
    if 'source' not in kw:
        kw['source'] = bld.path.ant_glob(SOURCE_EXTS)

    if not program_name:
        program_name = bld.path.name

    if use_legacy_defines:
        kw['defines'].extend(get_legacy_defines(bld.path.name))

    kw['cxxflags'] = kw.get('cxxflags', []) + ['-include', 'ap_config.h']
    kw['features'] = kw.get('features', []) + bld.env.AP_PROGRAM_FEATURES

    program_groups = Utils.to_list(program_groups)

    if not program_dir:
        program_dir = program_groups[0]

    name = os.path.join(program_dir, program_name)

    tg_constructor = bld.program
    if bld.env.AP_PROGRAM_AS_STLIB:
        tg_constructor = bld.stlib
    else:
        if bld.env.STATIC_LINKING:
            kw['features'].append('static_linking')


    tg = tg_constructor(
        target='#%s' % name,
        name=name,
        program_name=program_name,
        program_dir=program_dir,
        **kw
    )

    for group in program_groups:
        _grouped_programs.setdefault(group, []).append(tg)

@conf
def ap_example(bld, **kw):
    kw['program_groups'] = 'examples'
    ap_program(bld, use_legacy_defines=False, **kw)

def unique_list(items):
    '''remove duplicate elements from a list while maintaining ordering'''
    return list(OrderedDict.fromkeys(items))

@conf
def ap_stlib(bld, **kw):
    if 'name' not in kw:
        bld.fatal('Missing name for ap_stlib')
    if 'ap_vehicle' not in kw:
        bld.fatal('Missing ap_vehicle for ap_stlib')
    if 'ap_libraries' not in kw:
        bld.fatal('Missing ap_libraries for ap_stlib')

    kw['ap_libraries'] = unique_list(kw['ap_libraries'] + bld.env.AP_LIBRARIES)
    for l in kw['ap_libraries']:
        bld.ap_library(l, kw['ap_vehicle'])

    kw['features'] = kw.get('features', []) + ['cxx', 'cxxstlib']
    kw['target'] = kw['name']
    kw['source'] = []

    bld.stlib(**kw)

_created_program_dirs = set()
@feature('cxxstlib', 'cxxprogram')
@before_method('process_rule')
def ap_create_program_dir(self):
    if not hasattr(self, 'program_dir'):
        return
    if self.program_dir in _created_program_dirs:
        return
    self.bld.bldnode.make_node(self.program_dir).mkdir()
    _created_program_dirs.add(self.program_dir)

@feature('cxxstlib')
@before_method('process_rule')
def ap_stlib_target(self):
    if self.target.startswith('#'):
        self.target = self.target[1:]
    self.target = '#%s' % os.path.join('lib', self.target)

@conf
def ap_find_tests(bld, use=[]):
    if not bld.env.HAS_GTEST:
        return

    features = []
    if bld.cmd == 'check':
        features.append('test')

    use = Utils.to_list(use)
    use.append('GTEST')

    includes = [bld.srcnode.abspath() + '/tests/']

    for f in bld.path.ant_glob(incl='*.cpp'):
        ap_program(
            bld,
            features=features,
            includes=includes,
            source=[f],
            use=use,
            program_name=f.change_ext('').name,
            program_groups='tests',
            use_legacy_defines=False,
            cxxflags=['-Wno-undef'],
        )

_versions = []

@conf
def ap_version_append_str(ctx, k, v):
    ctx.env['AP_VERSION_ITEMS'] += [(k, '"{}"'.format(os.environ.get(k, v)))]

@conf
def write_version_header(ctx, tgt):
    with open(tgt, 'w') as f:
        print('#pragma once\n', file=f)

        for k, v in ctx.env['AP_VERSION_ITEMS']:
            print('#define {} {}'.format(k, v), file=f)

@conf
def ap_find_benchmarks(bld, use=[]):
    if not bld.env.HAS_GBENCHMARK:
        return

    includes = [bld.srcnode.abspath() + '/benchmarks/']

    for f in bld.path.ant_glob(incl='*.cpp'):
        ap_program(
            bld,
            features=['gbenchmark'],
            includes=includes,
            source=[f],
            use=use,
            program_name=f.change_ext('').name,
            program_groups='benchmarks',
            use_legacy_defines=False,
        )

def test_summary(bld):
    from io import BytesIO
    import sys

    if not hasattr(bld, 'utest_results'):
        Logs.info('check: no test run')
        return

    fails = []

    for filename, exit_code, out, err in bld.utest_results:
        Logs.pprint('GREEN' if exit_code == 0 else 'YELLOW',
                    '    %s' % filename,
                    'returned %d' % exit_code)

        if exit_code != 0:
            fails.append(filename)
        elif not bld.options.check_verbose:
            continue

        if len(out):
            buf = BytesIO(out)
            for line in buf:
                print("    OUT: %s" % line.decode(), end='', file=sys.stderr)
            print()

        if len(err):
            buf = BytesIO(err)
            for line in buf:
                print("    ERR: %s" % line.decode(), end='', file=sys.stderr)
            print()

    if not fails:
        Logs.info('check: All %u tests passed!' % len(bld.utest_results))
        return

    Logs.error('check: %u of %u tests failed' %
               (len(fails), len(bld.utest_results)))

    for filename in fails:
        Logs.error('    %s' % filename)

    bld.fatal('check: some tests failed')

_build_commands = {}

def _process_build_command(bld):
    if bld.cmd not in _build_commands:
        return

    params = _build_commands[bld.cmd]

    targets = params['targets']
    if targets:
        if bld.targets:
            bld.targets += ',' + targets
        else:
            bld.targets = targets

    program_group_list = Utils.to_list(params['program_group_list'])
    bld.options.program_group.extend(program_group_list)

def build_command(name,
                   targets=None,
                   program_group_list=[],
                   doc='build shortcut'):
    _build_commands[name] = dict(
        targets=targets,
        program_group_list=program_group_list,
    )

    class context_class(Build.BuildContext):
        cmd = name
    context_class.__doc__ = doc

def _select_programs_from_group(bld):
    groups = bld.options.program_group
    if not groups:
        if bld.targets:
            groups = []
        else:
            groups = ['bin']

    if 'all' in groups:
        groups = _grouped_programs.keys()

    for group in groups:
        if group not in _grouped_programs:
            bld.fatal('Group %s not found' % group)

        tg = _grouped_programs[group][0]
        if bld.targets:
            bld.targets += ',' + tg.name
        else:
            bld.targets = tg.name

        for tg in _grouped_programs[group][1:]:
            bld.targets += ',' + tg.name

def options(opt):
    opt.ap_groups = {
        'configure': opt.add_option_group('Ardupilot configure options'),
        'build': opt.add_option_group('Ardupilot build options'),
        'check': opt.add_option_group('Ardupilot check options'),
        'clean': opt.add_option_group('Ardupilot clean options'),
    }

    g = opt.ap_groups['build']

    g.add_option('--program-group',
        action='append',
        default=[],
        help='''
Select all programs that go in <PROGRAM_GROUP>/ for the build. Example: `waf
--program-group examples` builds all examples. The special group "all" selects
all programs.
''')

    g.add_option('--upload',
        action='store_true',
        help='''
Upload applicable targets to a connected device. Not all platforms may support
this. Example: `waf copter --upload` means "build arducopter and upload it to
my board".
''')

    g = opt.ap_groups['check']

    g.add_option('--check-verbose',
        action='store_true',
        help='Output all test programs.')

    g = opt.ap_groups['clean']

    g.add_option('--clean-all-sigs',
        action='store_true',
        help='''
Clean signatures for all tasks. By default, tasks that scan for implicit
dependencies (like the compilation tasks) keep the dependency information
across clean commands, so that that information is changed only when really
necessary. Also, some tasks that don't really produce files persist their
signature. This option avoids that behavior when cleaning the build.
''')

def build(bld):
    bld.add_pre_fun(_process_build_command)
    bld.add_pre_fun(_select_programs_from_group)
